JPH11131424A - Laminated rubber bearing body for bridge beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated rubber bearing body capable of effectively constraining the horizontal displacement of a bridge with a simple structure as a bearing for fixed fulcrum. SOLUTION: A laminated rubber bearing body l for fixed fulcrum is interposed between a substructure 7 such as abutment, pier or the like and a superstructure 8 such as bridge girder and fixed. The laminated rubber bearing body 1 is formed by fixing an upper support member 5 and a lower support member 6 to the upper and lower surfaces of a laminated rubber consisting of a plurality of rubber plates 2 and steel plates 3 alternately laminated, forming at least one through-hole 13 in the height direction on the flat center part of the laminated rubber, and inserting a bar-like material 14 consisting of a non-plastic deforming material to the through-hole 13 with a prescribed space (h).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber bearing for a bridge, and more particularly, to a bridge between a lower structure such as an abutment and a pier and an upper structure such as a bridge girder to restrict the movement of the bridge girder. The present invention also relates to a laminated rubber bearing for a bridge used as a fixed fulcrum for effectively preventing the drop of a bridge girder.

[0002]

2. Description of the Related Art Among laminated rubber bearings conventionally used in bridges and the like, a laminated rubber bearing 1 for a fixed fulcrum that is interposed between a lower structure such as an abutment or a pier and an upper structure such as a bridge girder. As shown in FIGS. 3 and 4, for example,
An upper support member 5 and a lower support member 6 are fixed to upper and lower surfaces of a laminated rubber 4 in which a plurality of rubber plates 2 and steel plates 3 are alternately laminated, and the laminated rubber support 1 is a lower structure 7. And the upper structure 8, and the surroundings are surrounded by a steel material 9 so as to restrain the displacement in the horizontal direction.

As another method, as shown in FIG. 5, a bridge girder 10 is erected at a predetermined interval on a laminated rubber bearing 1 installed on a substructure 7 such as an abutment or a pier.
A horizontal girder 12 having an anchor bar 11 embedded in the bridge girder 10.
And the laminated rubber support 1 is fixed by a fixing device such as an anchor bar 11.

[0004]

However, in the former case, the conventional laminated rubber bearing for a fixed fulcrum is disposed so as to surround the laminated rubber bearing 1 with a steel material 9. As a result, the steel material 9 is always exposed to the outside. Therefore, there is a problem in corrosion resistance and a problem in workability in a narrow bearing mounting portion.

[0005] In the latter case, there is a problem that the structure of the fixing device is complicated and the cost is increased. An object of the present invention is to provide a bearing for a fixed fulcrum with a simple configuration,
An object of the present invention is to provide a laminated rubber bearing for a bridge which can effectively restrain horizontal displacement of a bridge girder.

[0006]

According to the present invention, at least one through hole is formed in a plane of a laminated rubber in a height direction, and a predetermined gap is formed in the through hole. The gist of the present invention is that a rod-shaped material made of a non-plastically deformable material is inserted therebetween. In this way, since the rod-shaped material made of non-plastically deformable material is inserted through the inside of the laminated rubber, unnecessary horizontal displacement as a fixed bearing can be restrained by the rod-shaped material, making the appearance very simple. The workability at the mounting portion is improved, and the through-hole and the rod-shaped material are inserted with a predetermined gap therebetween, so that the rotation performance for absorbing the bending of the bridge girder is not impaired.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a longitudinal sectional half-sectional view of a laminated rubber bearing 1 for a fixed fulcrum embodying the present invention, and FIG. 2 is a plan view of the laminated rubber bearing 1. It is fixed by being interposed between a lower structure 7 such as an abutment and a pier and an upper structure 8 such as a bridge girder.

In the laminated rubber support 1, an upper support member 5 and a lower support member 6 are fixed to upper and lower surfaces of a laminated rubber 4 in which a plurality of rubber plates 2 and steel plates 3 are alternately laminated. At least one or more through-holes 13 are formed in the center of the plane of the laminated rubber 4 in the height direction, and the rod-like material 1 made of a non-plastically deformable material is formed in the through-holes 13 with a predetermined gap h.
4 is inserted.

The rod-shaped material 14 made of a non-plastically deformable material such as a steel rod is a rod-shaped material made of a steel material having a circular or polygonal cross section, and a distance of several mm between the rod-shaped material 14 and the through hole 13. Are formed to maintain the rotational performance of absorbing the deflection of the bridge girder. In the above-described embodiment, the rod-shaped material 14 is provided so as to penetrate one at the center of the plane of the laminated rubber 4. However, as shown by the dotted line in FIG.

As described above, since the rod-shaped material 14 made of a non-plastically deformable material is penetrated through the through-hole 13 formed in the center portion of the laminated rubber 4 at a predetermined interval, the laminated rubber support 1 Bar-shaped material 1 that does not require horizontal displacement as a fixed bearing
4 and the appearance is very simple, and the workability at the mounting portion of the bearing is improved. Furthermore, the through hole 13
And the rod-shaped material 14 are inserted with a predetermined gap therebetween, so that the rotation performance for absorbing the bending of the upper structure 8 such as a bridge girder is not impaired.

[0011]

According to the present invention, at least one through-hole is formed in the plane of the laminated rubber in the height direction as described above, and the non-plastically deformable material is formed in the through-hole with a predetermined gap. Since the rod-shaped material made of is inserted, the following excellent effects can be obtained. . Unnecessary horizontal displacement as a fixed bearing for the laminated rubber bearing can be restrained by the rod-shaped material. . The appearance is very simple, and the workability at the bearing mounting part is also good. . Since the through-hole and the rod-shaped material are inserted with a predetermined gap therebetween, the rotation performance for absorbing the bending of the bridge girder is not impaired. . Since the configuration is simple, it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal half sectional view of a laminated rubber bearing for a fixed fulcrum embodying the present invention.

FIG. 2 is a plan view of a laminated rubber bearing.

FIG. 3 is a longitudinal half sectional view of a conventional laminated rubber bearing for a fixed fulcrum perpendicular to a bridge axis.

FIG. 4 is a longitudinal sectional half view of a conventional laminated rubber bearing for a fixed fulcrum in the bridge axis direction.

FIG. 5 is a cross-sectional view showing a bridge girder support structure fixed by a conventional anchor bar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Laminated rubber bearing 2 Rubber plate 3 Steel plate 4 Laminated rubber 5 Upper support member 6 Lower support member 7 Lower structure 8 Upper structure 9 Steel material 10 Bridge girder 11 Anchor bar 12 Cross girder 13 Through hole 14 Rod material

Claims (2)

[Claims] 1. A laminate comprising an upper support member and a lower support member fixed to upper and lower surfaces of a laminated rubber in which a plurality of rubber plates and steel plates are alternately laminated between an upper structure and a lower structure. In a laminated rubber bearing for a bridge comprising a rubber bearing, at least one or more through-holes are formed in a plane portion of the laminated rubber in a height direction, and a predetermined gap is provided between the through-holes. A laminated rubber bearing for a bridge, wherein a rod-shaped material made of a non-plastically deformable material is inserted. 2. The bar-shaped material made of the non-plastically deformable material is a bar made of a steel material having a circular or polygonal cross section, and a gap of several mm is formed between the bar-shaped material and the through hole. 4. The laminated rubber bearing for a bridge according to the above.